Jaevis b



(No Model.)

J. B. EDSON.

PNEUMATIC GHBGK FOR DOORS, 8:0. No. 352,233. 7 v Patented Nov.- 9, 1886.

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Zzueniar UNITED STATES PAT NT ()FFICE JARVIS B. EDSO N, OF BROOKLYN, NFlW'YORK.

PNEUMATIC CHECK FOR DOORS, 8 .0.

SPECIPICATIONforining part of Letters Patent No. 352,233, dated November 9, 1886.

Application filed June 18, 1886. Serial No. 205,578. (No model.)

To all it fltayboncern;

Be it known that 1, JARVIS B.-E1)soN, of the city of Brooklyn, in thecounty of Kings and State of New York, have invented a certain new and useful Improvement in Pneumatic Door-Checks,

of which the following is a specification.

My invention relates to door-checks which are to be applied between the door and its casing, and in which the slamming of the door is prevented by the slow escape of a body of: In such devices as heretofore: constructed, and which have severally comprised a piston and cylinder or analogous; parts, .packingof variouskinds has been em-;

confined air.

ployed to make the parts work with sufficient tightness tobe effective. Such packing is objectionable because of the attention necessary cape which offers the sole or principal avenue of escape from confinement; and with this object in view I construct a door-check of two reversed cup-shaped members, each composed to replacetit when wornout and to tighten it from time to time, and is still further objectionable because if working with tightness sufficient to perform its proper function it offers a very considerable frictional resistance to the operation of the device.

. The object of my invention is to provide a pneumatic door-check in which the air is controlled not by packing, but by a tortuous esof one or more cylindric cups fitting together without packing, with each cup of one member loosely entering a corresponding cup of the other member, so as to form a tortuous passage for the escape of air from the members. cups in one or both members may be perforated to regulate the admission or escape of air 5 and to make the device more effective I provide within it a displacing trunk or body, which, when the members are forced one entirely into the; other, will displace nearly all the air, and so render the. device more effective.

The features of construction above referred to are included in my invention. I also provide a rod or stop wherebythe outward movement of the movable part is limited.

The invention also consists in the combination, with a pneumatic door-check composed of reversed cup-shaped member's fitting one within the other and having. a stop for. limitingrthe outward movement of one member The A from the other, of an engaging device to be secured to a door or door-casing, and constructed to engage automatically with the movable member as the door closes, and to disengage itself. from or pull off the movable member after producing its outward movement as the door is. opened. This engaging device may be made of expansible and elastic material such as india-rubberand perforated to antomatically engage with and disengage itself from a knob or head on the movable member.

In the accompanying drawings, Figure 1 is a perspective view of a part of a door-casing and door with my door-check applied thereto. Fig. 2 is an axial section of the check and the automatic engaging device, together with parts of the casing and door. of the door-check, and Fig. 4 is an axial section of a door-check in which the expansion or outward movement of the movable member is produced by a spring.

Similar letters of reference designate corresponding parts in all the figures.

A designates the door-casing, and A the door.

The door-check, which is in this example of my invention secured to the door-casing, consists of reversed cup-shaped cylindric parts or members B O, the former of which is secured to a base or hanger, D, whereby it is attached to the dooncasing, and the latter of which is movable axially relatively to the member B.

Each of the two members B O is composed of one or more cylindric cups or a nest of cylindric cups, of slightly-different sizes and secured one within another-r Each cup of one member or series enters into a cup of the other member and fits comparatively snugly therein, but without any packing.

The purposes of my invention would in a measure be carried out by a single cup composing one member entering between two cups of the other member; but to make the device more effective I have here shown the members Fig. 3 is an end view BOas each composed of three cups, 6 b b and c c. 0. .By thus fitting the cups of the two members together without packing a tortuous passage is formed between them for the escape of the air contained within them when pressureis applied to the movable member 0 and it is forced into the fixed member B. The throttling of the air by compelling it to pass through the tortuous passage formed between the cups of the two members will offer agreat resistance to the inward movement of the member when struck violently, as it would be by the door A if closed by a spring, although it will offer but little resistance to such movement of the memberO if acted upon by a gentle and continued pressure.

In order to insure the expulsion of substantially all the air,from the device, and to avoid the simple compression of the air within it, I have represented an air-displacing trunk or body, E, located in the interior of the device, and which substantially fills the space when the member 0 is forced fully into the member B.

As here represented, the several cups b b b and the trunk or body E are held in place on the base D by a screw or screws, (1, and a steady-pin, d, may be provided to hold the trunk or body E central in the device.

To hold the cups 0 c c of the movable member 0 together, in Fig. 2 I have shown a rod, F, guided in the trunk or body E, and having a shoulder, e, and a nut, e, between which the said cups are secured. The rod is surrounded in the trunk or body E by a packing or bushing, 6 to prevent the escape of air around it. The nut c constitutes a knob or head on the movable part, for a purpose hereinafter described. The rod F forms a stop, to limit the outward movement of the movable member 0 relatively to the fixed member.

To provide for the entrance of air when the movable member 0 is drawn outward, I have represented the cups 0 c c in Fig. 2 as perforated at f, and by turning them one relatively to another such perforations may be more or less or entirely closed. The cups may be held in positions to which they are adjusted by one or more bolts or screws, h, passing through slots h in the cups, as shown in Fig. 3.

G designates the automatic engaging device, which may be attached to the door A by screws 6. If the door-check is on the door, such engaging device would be on the casing. It is perforated at the center and made of india-rubber or analogous expansible and elastic material, which will enable it to spring over and grasp the knob or head 6 when the door swings closed. When the door is opened, the device G, grasping the knob or head 6, draws out the movable member 0 until the rod F stops such outward movement, whereupon the said device G automatically disengages itself from or pulls off the said knob or head.

In the example of my invention shown in Fig. 4 the movable member 0 simply has a cushion, j, on which the door may strike, and when the movable part is forced inward and the door again opened said'part will be returned outward by a spring, H. In this example of theinvention the air-displacing trunk or body E is on the movable part 0, and the rod F, which is fast to said part, plays through the fixed member or part. In this case also the air-holes fare in the cups 5 b b of the fixed part, as are also the bolts or screws h, for holding the cups in place after circular adjustment, to properly regulate the air inlet and outlet through the perforations f.

It will be seen by my invention 1 dispense with any packing which requires renewal and frequent attention.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. A pneumatic door-check composed of two reversed cylindric cup-shaped members, each comprising one or more cylindrie cups and fitting together without packing, with each cup of one member loosely entering a corresponding cup of the other member, so as to form a tortuous passage for the escape of air from the interior of the members,substantially as herein described.

2. A pneumatic door-check composed of two reversed cylindric cup-shaped members, each comprising one or more cylindric cups, which in one or both members are perforated to regulate the admission or escape of air, and which are fitted together without packing, and with each cup of one member loosely entering a corresponding cup of the other member, so as to form a tortuous passage for the escape of air from the interior of the members, substantially as herein described.

'3. A pneumatic door-check composed of two reversed cylindric cup-shaped members, each comprising one or more cylindric cups, which are fitted together without packing, with each cup of one member loosely entering a corresponding cup of the other member, so as to form a tortuous passage for air, in combination with an air-displacing trunk or body interiorly located, substantially as herein described.

4. A pneumatic door-check composed of two reversed cylindric cup-shaped members, each comprising one or more cylindric cups, which in one or both members are perforated to regulate the admission or escape of air, and which are fitted together without packing,and with each cup of one member loosely entering a corresponding cup of the other member, so as to form a tortuous passage for the escape of air, in combination with an air-displacing trunk or body interiorly located, substantially as herein described.

5. A pneumatic door-check composed of reversed cylindric cup-shaped members, each comprising one or more cylindric cups and fitting together without packing, with each cup of one member loosely entering a corresponding cup of the other member, so as to form a tortuous passage for the escape of air from the interior of the members, and having arod connecting the two members and preventing their disengagement, substantially as herein described.

6. The combination,with a pneumatic doorcheck composed of reversed cup-shaped member from the other, of an engaging device to be member being provided with a knob or head, secured to a door or casing, and constructed of the engaging device G, made of expansible I 5 to engage automatically with the movable material and perforated to automatically enmember as the door closes, and to disengage gage with and disengage itself from said knob 5'itself from or pull off the movable member or head, substantially as herein described. after producing its outward movement as the In testimony that I claim the foregoing 1 door is opened,snbstantially as herein dehereto sign my name in the presence of two 20 scribed. V subscribing witnesses.

7. The combinatiomwith a pneumatic door- 10 check composed of reversed cup-shaped mem- JARVIS N' bers fitting one within the other, and a stop Witnesses: for limiting the outward movement of one FREDK. HAYNES member away from the other, said movable HENRY J. MCBRIDE. 

